Webster's English Dictionary

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tandem

1. tan.dem \'tan-d*m\ n [L, at last, at length (taken to mean 
   "lengthwise"), fr. tam so; akin to]OE tht that 1a1: a 2-seated 
   carriage drawn by horses harnessed one before the other  1a2: a team so 
   harnessed  1b: a vehicle having close-coupled pairs of axles  2: a group of 
   two or more arranged one behind the other or used or acting i n conjunction
2. tandem av(or aj) : one after or behind another